Portable lamp



FIG. 1 is a front perspective view of a portable lamp in accordance with my new design with an optional slidable light shield shown in phantom line;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a back elevational view thereof; and

FIG. 6 is an end elevational view thereof. 

The ornamental design for a portable lamp, as shown. 